Cover for thermostat



FIG. 1 is a perspective top front right view of a cover for a thermostat, showing my new design;

FIG. 2 is a perspective top rear left view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a left elevation plan view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The dashed lines representing mounting locations for fasteners form no part of the claim of the design. 

CLAIM The ornamental design for a cover for a thermostat, as shown and described. 